[Bug 108585] *ERROR* hw_init of IP block <gfx_v8_0> failed -22

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108585

Christian König <ckoenig.leichtzumerken at gmail.com> changed:

           What    |Removed                     |Added
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         Resolution|---                         |NOTABUG
             Status|NEW                         |RESOLVED

--- Comment #9 from Christian König <ckoenig.leichtzumerken at gmail.com> ---
(In reply to Benjamin Herrenschmidt from comment #6)
> They may or may not be related ... Alex, kexec is how we boot these
> machines, there's a Linux kernel in flash that runs a Linux based bootloader.

Yeah, you guys should have noted that because that combination is known to not
work correctly.

The problem is that some parts of the hardware are explicitly designed in a way
which only allows loading one firmware after an ASIC reset. So as long as kexec
doesn't makes a full PCIe level ASIC reset the second driver load is intended
to fail.

We have the same problem with virtualization and used to have a workaround in
KVM which triggers the ASIC reset with a PCIe config space write. Alex should
know the details.

Only solution I can see is to either use the same workaround as the KVM guys or
use the same firmware for both the loader and the final kernel.

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